Like the 3,4-methylenedioxy version of 4-methylaminorex, the 3,4-MDO analogue of methylphenidate has never been tested or appeared on the research chemical scene to my knowledge. And it's not for a lack of me and other people suggesting that they be made and tested. In fact, someone posted an (unauthorized) picture taken of the blackboard of Alexander Shulgin before he died with the structure of 3,4-MDO-4-MAR drawn out with the caption, "Make Me," under it.
As for the cocamentholene, I would expect it to have greatly reduced activity compared to cocaine based on the analogy--which may or may not be an accurate one, admittedly (the only way to know any of this for sure is to make the compound and test it for activity)--that EPH is of greatly reduced activity to MPH, and MPH and cocaine share similar modes of action along with a carbomethoxy group as well.